Setup VNC Server (x11vnc) on Linux Mint 18

1. Remove the default Vino server:
sudo apt-get -y remove vino
2. Install x11vnc:
sudo apt-get -y install x11vnc
3. Create the directory for the password file:
sudo mkdir /etc/x11vnc
4. Create the encrypted password file:
sudo x11vnc --storepasswd /etc/x11vnc/vncpwd
You will be asked to enter and verify the password.  Then press Y to save the password file.
5. Create the systemd service file for the x11vnc service:
sudo nano /lib/systemd/system/x11vnc.service
Copy/Paste this code into the empty file:
[Unit]
Description=Start x11vnc at startup.
After=multi-user.target
[Service]
Type=simple
ExecStart=/usr/bin/x11vnc -auth guess -forever -noxdamage -repeat -rfbauth /etc/x11vnc/vncpwd -rfbport 5900 -shared
[Install]
WantedBy=multi-user.target

6: Reload the services:
sudo systemctl daemon-reload
7. Enable the x11vnc service at boot time:
sudo systemctl enable x11vnc.service
8. Start the service:
Either reboot or

sudo systemctl start x11vnc.service